Aim:To studyin detailabout cloud computing.
Introduction to Cloud Computing
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Thetermcloudhasbeenusedhistorically asametaphorfortheInternet.This
usagewasoriginallyderivedfromitscommondepictioninnetworkdiagramsasanoutlineof
acloud,usedtorepresentthetransportofdata acrosscarrierbackbones(whichownedthe
cloud)toanendpointlocationontheothersideofthecloud.Thisconceptdatesbackasearly
as1961,whenProfessorJohnMcCarthy suggestedthatcomputertime-sharingtechnology
mightleadtoafuture wherecomputingpower andevenspecific applicationsmightbesold
throughautility-typebusinessmodel.1Thisideabecameverypopularinthelate1960s,but bythemid-
1970stheideafadedaway whenitbecameclearthattheIT-relatedtechnologies of theday
wereunabletosustainsuchafuturisticcomputingmodel.However,sincetheturnof themillennium,
theconcepthasbeenrevitalized.Itwasduring thistimeofrevitalizationthat
thetermcloudcomputingbegantoemergeintechnology circles.Cloudcomputing isamodel for
enabling convenient, on-demand network access to a shared pool of configurable computing
resources(e.g., networks,servers,storage,applications,and services)thatcanbe rapidly
provisionedandreleasedwithminimalmanagementeffortorserviceprovider
interaction.ACloudisatypeofparallelanddistributed systemconsisting ofacollectionof inter-
connectedandvirtualizedcomputersthataredynamically provisionedandpresentedas oneormore
unifiedcomputing resource(s) basedonservice-levelagreementsestablished through negotiation
between the serviceproviderand consumers.
Whenyoustoreyour photosonline insteadof onyour homecomputer, oruse
webmailorasocialnetworking site,youareusing acloudcomputing service.Ifyouareinan
organization, and you want to use, for example, an online invoicing service instead of updating
thein-houseoneyouhavebeenusingformanyyears,thatonlineinvoicing serviceis
a―cloudcomputingservice.Cloudcomputingisthedeliveryofcomputingservicesoverthe
Internet.Cloudservices,Allowindividualsandbusinessestousesoftware andhardware that
aremanagedbythirdpartiesatremotelocations.Examplesofcloudservicesincludeonline
filestorage,socialnetworking sites, webmail,andonlinebusinessapplications.Thecloud
computingmodelallowsaccesstoinformationandcomputerresourcesfromanywhere.Cloud
computing provides a shared pool of resources, including data storage space, networks, Computer
processingpower, and specialized corporate and user applications.